Credenza shelf



FIG. 1 is a top plan view of a credenza shelf showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a right side elevational view thereof; and,

FIG. 4 is a rear elevational view thereof.

The left side elevational view is substantially identical to the right side elevational view of FIG. 3; and, the bottom plan view is substantially identical to the top plan view of FIG. 1. 

The ornamental design for a credenza shelf, substantially as shown and described. 